Characterization of a 6 MV photon beam in terms of primary and scattered dose components

dc.contributor.advisorHering, E Ren_ZA
dc.contributor.advisorNieto-Camero, Jaimeen_ZA
dc.contributor.authorTrauernicht, Christoph Janen_ZA
dc.date.accessioned2014-07-28T11:10:08Z
dc.date.available2014-07-28T11:10:08Z
dc.date.issued2009en_ZA
dc.description.abstractThe purpose of this work was to partition the 6 MV photon beam of a Philips SL75-5 linear accelerator into primary and scattered dose components in water. The two quantities that are necessary to define the primary beam component are a reference dose DR and a primary linear attenuation coefficient μ 0. DR describes the magnitude of the primary dose as a fraction of the total dose in a reference field at a reference depth, while μ 0 describes how the primary dose changes with depth in a medium. The scattered component is the difference between the primary and total dose. μ 0 for the beam in water was determined in four different ways, namely through the extrapolation of measured TMRs to zero field size, through linear attenuation measurements, through the fit of a convolution model to CAPDD data and through a method involving a central axis attenuator. The primary dose component was determined in two ways, namely by the extrapolation of the phantom scatter correction factor to zero field size and also by the central axis attenuator method. μ 0 varied from 0.0445 cm-1 to 0.0469 cm-1 with an average of 0.0455 +- 0.0012 cm-1. DR for a 10 cm x 10 cm field at the depth of maximum dose was found to vary between 0.933 Gy/ 100 MU and 0.935 Gy/ 100 MU, with an average of 0.934 Gy/ 100 MU. These values agree very well with values published in the literature. It has thus been shown that the 6 MV photon beam is separable into primary and scattered dose components.en_ZA
dc.identifier.apacitationTrauernicht, C. J. (2009). <i>Characterization of a 6 MV photon beam in terms of primary and scattered dose components</i>. (Thesis). University of Cape Town ,Faculty of Health Sciences ,Division of Medical Physics. Retrieved from http://hdl.handle.net/11427/2801en_ZA
dc.identifier.chicagocitationTrauernicht, Christoph Jan. <i>"Characterization of a 6 MV photon beam in terms of primary and scattered dose components."</i> Thesis., University of Cape Town ,Faculty of Health Sciences ,Division of Medical Physics, 2009. http://hdl.handle.net/11427/2801en_ZA
dc.identifier.citationTrauernicht, C. 2009. Characterization of a 6 MV photon beam in terms of primary and scattered dose components. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Trauernicht, Christoph Jan AB - The purpose of this work was to partition the 6 MV photon beam of a Philips SL75-5 linear accelerator into primary and scattered dose components in water. The two quantities that are necessary to define the primary beam component are a reference dose DR and a primary linear attenuation coefficient &Icirc;¼ 0. DR describes the magnitude of the primary dose as a fraction of the total dose in a reference field at a reference depth, while &Icirc;¼ 0 describes how the primary dose changes with depth in a medium. The scattered component is the difference between the primary and total dose. &Icirc;¼ 0 for the beam in water was determined in four different ways, namely through the extrapolation of measured TMRs to zero field size, through linear attenuation measurements, through the fit of a convolution model to CAPDD data and through a method involving a central axis attenuator. The primary dose component was determined in two ways, namely by the extrapolation of the phantom scatter correction factor to zero field size and also by the central axis attenuator method. &Icirc;¼ 0 varied from 0.0445 cm-1 to 0.0469 cm-1 with an average of 0.0455 +- 0.0012 cm-1. DR for a 10 cm x 10 cm field at the depth of maximum dose was found to vary between 0.933 Gy/ 100 MU and 0.935 Gy/ 100 MU, with an average of 0.934 Gy/ 100 MU. These values agree very well with values published in the literature. It has thus been shown that the 6 MV photon beam is separable into primary and scattered dose components. DA - 2009 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2009 T1 - Characterization of a 6 MV photon beam in terms of primary and scattered dose components TI - Characterization of a 6 MV photon beam in terms of primary and scattered dose components UR - http://hdl.handle.net/11427/2801 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/2801
dc.identifier.vancouvercitationTrauernicht CJ. Characterization of a 6 MV photon beam in terms of primary and scattered dose components. [Thesis]. University of Cape Town ,Faculty of Health Sciences ,Division of Medical Physics, 2009 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/2801en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDivision of Medical Physicsen_ZA
dc.publisher.facultyFaculty of Health Sciencesen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMedicineen_ZA
dc.titleCharacterization of a 6 MV photon beam in terms of primary and scattered dose componentsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
thesis_hsf_2009_trauernicht_c.pdf
Size:
2.46 MB
Format:
Adobe Portable Document Format
Description:
Collections